Every one of these points I have a reaction to, but I'll try to keep it simple (knowing me, that's a big "pft, yeah right"):
-I think it's cool that we'll get a recap video of the whole story, especially since they've said that this is a game newcomers could go straight into, so it's easy for them too. Plus it might make the story easier to understand for those who don't know it yet. I'll remember to grab my popcorn
-I want my KH3 demo, dang it!
-So if Kairi is considered one of the New 7 Hearts, does that mean the old princesses of heart have been debunked, or is it there's just more that fit that role, and Xehanort is trying for a different group this time?
-I like that Arendelle is going to expand on the story, especially since I remember people saying that the original script for Frozen was different from the release, which led to some lines being a little weird (anyone remember that "eternal winter line" when it was only a day, when the original script had it be a month later?)
-Please tell me we get to fight Davy Jones and he is voiced by Bill Nighy
-So is anyone else thinking of Assassin's Creed Black Flag right now with an open world environment and a pirate ship? Never played the game myself, but it's what my mind jumped to.
-Still makes me wonder if Roxas will lead to Ven waking up, or if we'll just get Roxas instead of Ven, or both Roxas and Ven.

I'd rather have Roxas over Ventus. Ventus is just way too immature and annoying and it's not until he becomes Roxas that he becomes likable.

Darn, I was really hoping Anna and Elsa would've been party members.

As for returns, I hope all of them come back, Roxas, Namine, and Xion. (I would say Ventus but I'm quite confident he'll definitely return.)